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Commit 3b692c55 authored by Daniel Drake's avatar Daniel Drake Committed by Andy Shevchenko
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HID: asus: only support backlight when it's not driven by WMI 



The Asus GL502VSK has the same 0B05:1837 keyboard as we've seen in
several Republic of Gamers laptops.

However, in this model, the keybard backlight control exposed by hid-asus
has no effect on the keyboard backlight. Instead, the keyboard
backlight is correctly driven by asus-wmi.

With two keyboard backlight devices available (and only the acer-wmi
one working), GNOME is picking the wrong one to drive in the UI.

Avoid this problem by not creating the backlight interface when we
detect a WMI-driven keyboard backlight.

We have also tested Asus GL702VMK which does have the hid-asus
backlight present, and it still works fine with this patch (WMI method
call returns UNSUPPORTED_METHOD).

A direct "depends on ASUS_WMI" is intentionally avoided so that HID_ASUS
users who have ASUS_WMI=n will not quietly lose their HID_ASUS driver on
a kernel upgrade.

Signed-off-by: default avatarDaniel Drake <drake@endlessm.com>
Reviewed-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
parent ffb6ce70

drivers/hid/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -149,6 +149,7 @@ config HID_APPLEIR 
config HID_ASUS

	tristate "Asus"

	depends on LEDS_CLASS

	depends on ASUS_WMI || ASUS_WMI=n

	---help---

	Support for Asus notebook built-in keyboard and touchpad via i2c, and

	the Asus Republic of Gamers laptop keyboard special keys.

drivers/hid/hid-asus.c

+22 −1
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <linux/dmi.h>

#include <linux/hid.h>

#include <linux/module.h>

#include <linux/platform_data/x86/asus-wmi.h>

#include <linux/input/mt.h>

#include <linux/usb.h> /* For to_usb_interface for T100 touchpad intf check */
@@ -349,6 +350,24 @@ static void asus_kbd_backlight_work(struct work_struct *work) 
		hid_err(led->hdev, "Asus failed to set keyboard backlight: %d\n", ret);

}



/* WMI-based keyboard backlight LED control (via asus-wmi driver) takes

 * precedence. We only activate HID-based backlight control when the

 * WMI control is not available.

 */

static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev)

{

	u32 value;

	int ret;



	ret = asus_wmi_evaluate_method(ASUS_WMI_METHODID_DSTS2,

				       ASUS_WMI_DEVID_KBD_BACKLIGHT, 0, &value);

	hid_dbg(hdev, "WMI backlight check: rc %d value %x", ret, value);

	if (ret)

		return false;



	return !!(value & ASUS_WMI_DSTS_PRESENCE_BIT);

}



static int asus_kbd_register_leds(struct hid_device *hdev)

{

	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
@@ -436,7 +455,9 @@ static int asus_input_configured(struct hid_device *hdev, struct hid_input *hi) 


	drvdata->input = input;



	if (drvdata->enable_backlight && asus_kbd_register_leds(hdev))

	if (drvdata->enable_backlight &&

	    !asus_kbd_wmi_led_control_present(hdev) &&

	    asus_kbd_register_leds(hdev))

		hid_warn(hdev, "Failed to initialize backlight.\n");



	return 0;